Rotating Fan Illusion

1}When you see a rotating fan, at the start it seems like rotating in opposite direction. Why does it look so? 2}This also happens when the fan is rotating at a very high speed.
In the first case, the illusion stays for few seconds. But in the second case, it remains as long as the fan is rotating.

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  • Ammar Aziz
    Ammar Aziz

    @ammar-aziz-7MLZYl • May 5, 2011

    really a good observation. this is due to something which i explain later inshahallah

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • May 6, 2011

    mreccentric1}When you see a rotating fan, at the start it seems like rotating in opposite direction. Why does it look so? 2}This also happens when the fan is rotating at a very high speed.
    In the first case, the illusion stays for few seconds. But in the second case, it remains as long as the fan is rotating.

    Stroboscopic effect. You will not see it in daylight. Tubelight, which has a high frequency flicker can cause this. Same effect is seen with car wheels or helicopter blades in films.

    Bioramani

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  • ABCD ABCD
    ABCD ABCD

    @abcd-2NEyMb • Jan 5, 2013

    Any idea why this image looks like it is? It's a image of ceiling fan taken from a movie.
    [​IMG]​No... i understood why it happens so. Thank You FOR THE ANSWERS of the prev question.

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  • Ankush Sharma
    Ankush Sharma

    @ankush-FCZUYR • Jan 5, 2013

    bioramaniStroboscopic effect.

    Bioramani

    dear please explain some more about this effect.

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Jan 6, 2013

    Anku2993dear please explain some more about this effect.

    Here is how it works. When the frequency of the light source matches the RPM of the fan it appears stationary.

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